cron executes job three times at the same time

rimvydazas · 02-07-2008, 10:13 AM

I have my /etc/crontab like this:

Code:

*/15 * * * *   root  test -x /usr/lib/cron/run-crons && /usr/lib/cron/run-crons >/dev/null 2>&1
*/5 * * * * root ntpdate 10.1.0.1 >/dev/null 2>&1
*/15 * * * * root /root/cdr/scripts/cdrcheck.sh

I get the output of my cdrcheck.sh to e-mail. Every 15 minutes I get three emails with cdrcheck.sh output. Does it mean that cdrcheck is executed 3 times every 15 min? and why the hell it would do that??
does it have something to do with updating time with ntpdate every 5 minutes. The thing is that system time is going ahead extremely fast so I use ntpdate to synchronize time every 5 min.

rimvydazas · 02-07-2008, 10:44 AM

Quote:

Originally Posted by rimvydazas

I have my /etc/crontab like this:

Code:

*/15 * * * *   root  test -x /usr/lib/cron/run-crons && /usr/lib/cron/run-crons >/dev/null 2>&1
*/5 * * * * root ntpdate 10.1.0.1 >/dev/null 2>&1
*/15 * * * * root /root/cdr/scripts/cdrcheck.sh

I get the output of my cdrcheck.sh to e-mail. Every 15 minutes I get three emails with cdrcheck.sh output. Does it mean that cdrcheck is executed 3 times every 15 min? and why the hell it would do that??
does it have something to do with updating time with ntpdate every 5 minutes. The thing is that system time is going ahead extremely fast so I use ntpdate to synchronize time every 5 min.

I guess I answered my own question. Disabling ntpdate to run every five minutes solves the problem. However, then I have time issue. Any ideas how to fool the system while using ntpdate and executing cdrcheck only once every 15 minutes?

Lepakko · 02-07-2008, 02:47 PM

Sounds like you need ntpd, the Network Time Protocol daemon.